Multiple-thread tension-release mechanism



Nov. 12, 1929. R. BECKER MULTIPLE THREAD TENSION RELEASE MECHANISM Filed June 22, 1927 .d w V Patented Nov. 12, 1929 UNITED STATES PATENT OFFICE RUDOLPH BECKER, OF NORTH PLAVINFIELD, NEW JERSEY, ASSIGNOR TO SINGER MANUFACTURING COMPANY, OF ELIZABETH,

NEW JERSEY NEW JERSEY, A CORPORATION OF MULTIPLE-THREAD TENSION-RELEASE MECHANISM Application led .Tuney 22,

, ate, and which is unlikely to get out of order.

In the preferred form of the invention, a plurality of tension devices of standard construction are mounted on one of three flat plates preierablyvof the same size and shape. The tension-carrying plate is carried by tourcorner-posts or studs secured to a second of said plates, which may be called the base-plate; the tension-carrying plate and base-plate being thus held in spaced parallel relation. The base-plate is secured to a bracket mounted on top of the sewing machine gooseneck. Slidably mounted on the corner-posts, between the tension-carrying plate and base-plate, is the third or movable plate which is shifted toward and away from the tension devices by a cam-mechanism actuated by a rock-shaft connected to the presser-foot lifter.

In the accompanying drawings Fig. 1 is a rear side elevation of a sewing machine gooseneck embodying the invention. F ig.`2 is a top plan view. Fig. 3 is a. transverse vertical sectional view. Fig. 4 is a perspective view oiy the movable tension-releasing plate and Fig. 5 is a perspective View of the actuating cam.

The invention is shown as embodied in a sewing machine having a gooseneck 1, to which is pivoted at 2 the usual lifting lever 3 for the presser-foot 3. Mounted on top ofy the gooseneck 1 is the bracket et in which is journaled the rock-shaft 5 actuated by the crank-arm 6 connected by a link 7 to the reark end 8 of the presser-lifting lever 3. Secured to the bracket 4 is a rectangular base-plate 9ky through which the rock-shaft 5 extends; such rock-shaft being formed with a circular head 10 havinga cylindrical iange 11 notched at diametrically opposed points to form cam-inclines 12. Fixed to the corners of the baseplate 9 are posts 13 which carry a tension-supporting plate 14 of the same size and shape as the base-plate't). The plate 14 has mounted thereon a plurality ot' tension devices of standard form including the usual tension disks 15 and tension release pins 16. Slidably 1927.y serial No. 200,594.

mounted on the posts 13 is a movable plate 17 having secured to its tace adjacent the bascplate 9 a cam-disk 18 formed with diametrically opposed cam-follower lugs 19 having inclined edges 20 matching the cam-inclines 12. A bow-spring 2l secured at 22 to the plate 141 urges the movable plate 17 toward the baseplate 9 and maintains the cam-follower constantly in engagement with the actuating cam member on the rock-shaft The entire device is removable from and replaceable upon the gooseneck l as a unitary assembly, being held thereon by the screw 23. rfhe invention isnot to be understood as limited to 'the details of construction oi the preferred embodiment illustrated as it is obviously susceptible of embodiment invarious specitically different forms within the scope of the invention defined by the appended claims.

Having thus set forth the nature of the invention, what I claim herein is 1. A multiple thread tension release mechanism comprising three plates disposed in spaced parallel relation, a plurality of osts fixed to the two outer plates and hold- 1ng them separated and relatively fixed, the intermediate plate being slidably mounted on said posts, a plurality of tension devices mounted on one of said fixed plates and having tension release pins extending through the latter, and means for shitting the movable plate toward the tension release pins.

2. A multiple thread tension release mechanism comprising three plates disposed inspaced yparallel relation, a plurality of posts for holding the two outer plates relatively iXed, the intermediate plate being movably mounted relative to said outer plates, a plurality of tension devices mounted on one ot' said outer plates and having tension-release pins extending through the latter, a rock-shaft extending through the plate in spaced relation with the latter, a movable plate intermediate said base-plate [sion-supporting. plate carried by the basehifi,-

and tension-supporting plate, a cam-follower on said movable plate, a plurality of tensiondeviees mounted on the tension-supporting plate and including release pins extending y tirough the tension-supporting plate and adapted to be simultaneously engaged by the movable intermediate plate, a rock-shaft transverse to and extending through said base-plate, and a cam-device on said rockshat cooperatively related to said cam-'fol-V lower for moving the intermediate plate.

4. A multiple -tliread tension-release mechanism comprising a base-plate, a tension-supporting plate carried by the baseplate in spaced relation With the latter, an intermediate movable tension-release plate, cam-follower lugs on said tension-release plate, a plurality of tensionlevices mounted on the tension-supporting plate and including' release pins extending through the tension-supporting plate and adapted to be simultaneously engaged by the movable intermediate plate, a rook-shaft transverse to and extending through said base-plate, and :i a. -3am-device on said rock-shaft in the form of circular head having a cylindrical flange formed With notches deining cam-inclines which are cooperatively related to said camfollovver lugs for moving the intermediate plat-e.

In testimony whereof, I have signed my name to this specilication.

` RUDOLPH BECKER. 

